Google (GOOG) — the sprawling giant of search — is up more than 50% for the year-to-date, and GOOG stock looks to have plenty more upside ahead.

But Yahoo (YHOO), under CEO Marissa Mayer, appears to have risen from the dead. Heck, YHOO stock has doubled so far in 2013 — something that was once unthinkable for a supposedly moribund tech brand. Like GOOG, next year promises to be another good one for YHOO stock.

GOOG had another strong year, with earnings per share (EPS) forecast to increase 18% on a 40% jump in revenue for all of 2013.

YHOO, meanwhile, is set to string together a second straight year of profit growth. Full-year EPS is forecast to rise 25% even as revenue remains essentially flat.

Yahoo stock may have won this round, but that doesn’t automatically mean it will trounce Google stock next year too.

To see which of these tech titans is the better bet for 2014, let’s look at some of the headwinds and tailwinds for Google stock and Yahoo stock in 2014: